police say the suspect in monday's new york city subway pushing death has been arrested and now charged with second-degree murder. davis was taken in to custody yesterday just one block from the subway station where a new york man was hit by a train after being pushed on to those tracks. meanwhile, the photographer who snapped a picture of the victim's last moments defended himself this morning against accusations that he could have done more to help. >> if this thing happened again, with the same circumstances, whether i had a camera or not and i was running towards it, there is no way i could have rescued mr. han. if i was in a reachable distance, i would have grabbed him and tried to pull him. >> the photographer also said there were people standing closer on the platform who may have been able to do something but didn't. he also gave his condolences to the victim's family. >>> coming up, bob costas gives his first tv interview with lawrence o'donnell since the controversial comments about guns and murder-suicide involving a nfl player. >> what i was talking about here, and i'm sorry